20388742177 has 2 divisors, whose sum is σ = 20388742178. Its totient is φ = 20388742176.

The previous prime is 20388742147. The next prime is 20388742207. The reversal of 20388742177 is 77124788302.

It is a balanced prime because it is at equal distance from previous prime (20388742147) and next prime (20388742207).

It can be written as a sum of positive squares in only one way, i.e., 17691394081 + 2697348096 = 133009^2 + 51936^2 .

It is a cyclic number.

It is not a de Polignac number, because 20388742177 - 2²⁷ = 20254524449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20388742177.

It is not a weakly prime, because it can be changed into another prime (20388742147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194371088 + 10194371089.

It is an arithmetic number, because the mean of its divisors is an integer number (10194371089).

Almost surely, 2^20388742177 is an apocalyptic number.

It is an amenable number.

20388742177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20388742177 is an equidigital number, since it uses as much as digits as its factorization.

20388742177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1053696, while the sum is 49.

The spelling of 20388742177 in words is "twenty billion, three hundred eighty-eight million, seven hundred forty-two thousand, one hundred seventy-seven".